カスリショウジョウバエ(Drosophila hydei STURTEVANT)における常染色体とX染色体との相互転座による限性遺伝
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A strain of Drosophila hydei STURTEVANT with a reciprocal translocation between the Xchromosome and the 3rd chromosome in a descendant of a cross between an X-ray irradiated wild type male and a wild type female. A further crosses were made between females homozygous for the translocation and curled males which were homozyous for cu, a recessive gene locating on the 3rd chromosome. Thus, the F_1 females were heterozygous for reciprocal translocation and also heterozygous for cu, which was further crossed with a wild type male. A crossover type chromosome, which was translocation and carried cu on a segment derived from the 3rd chromosome, was recovered in the F_5 larvae. Among F_8 families given by crosses between curled females and a single male of F_7, two families were peculiar in that all females were curled and all males were wild type. The difference between sexes was stable on the later generations. Thus, a system of sex-limited inheritance was established. In this final state, females were homozygous for the translocation and also homozygous for cu, and males were heterozgyous for translocation in terms of having a normal 3rd chromosome, altered 3rd chromosome and altered X-chromosome and heterozgyous for cu. The chromosome system securing the sex-limited inheritance was as follows: The altered 3rd chromosome with cu and an altered X-chromosome of the males were regularly transmitted to females of the offspring, while a normal 3rd chromosome with a wild type allele (+) of cu and a Y-chromosome of the males were regularly transmitted to the males of the offspring. The females gave eggs all containing an altered X-chromosome and an altered 3rd chromosome with cu.
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関連論文
- カスリショウジョウバエ(Drosophila hydei STURTEVANT)における常染色体とX染色体との相互転座による限性遺伝
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